must be unique
No grid data available...
all the cells must be either 1 or 0.
no more than 2 orthogonally adjacent cells can be the same number.
a row or column has an equal number of zeroes and ones.
each row has to be different, same for each column.
click on a Cell to switch numbers.
click Hints button for clues.
on "Save" don't forget to add to favorites also.
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